Differences

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--- at:tutorial:appendix [2020/02/05 21:01] – * elisag
+++ at:tutorial:appendix [2020/02/05 21:13] – adding elisag
@@ Line 633: / Line 633: @@
 The files in the ''at/support'' subdirectory of the standard library implement various utilities of use to the AmbientTalk programmer. We discuss the most useful modules below.
 ==== Timing Utilities ====
@@ Line 656: / Line 657: @@
 The timer module also defines a function ''whenever:elapsed:'' which repetitively invokes the given block closure every time the timeout period has elapsed. The returned subscription object can be used to eventually stop the repetitive invocation of the closure.
-The timer module defines a small number of additional utility functions which can be found in the file ''at/support/timer.at''.
+Finally, there is a variant of ''when:elapsed:'' called ''when:elapsedWithFuture:'' which returns a future that will be resolved or ruined by executing the given closure after the given timeout. This variant is very useful in unit tests, e.g:
+<code>
+def testAsyncNearbyPlayerReply(){
+  def nearbyPlayers := // search 2 nearby player orjbects;
+  // wait a bit so that there are the 2 members.
+  when: 2.seconds elapsedWithFuture:{
+	self.assertEquals(2, nearbyPlayers.getReceivedAnswers);
+  }
+};
+</code>
 ==== Logging Framework ====